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Texas Instruments LM2597HVN-12
- Part No.:
- LM2597HVN-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2597HVN-12.pdf
- Description:
- IC REG BUCK 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,658
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Product details
Overview
LM2597HVN-12 from Texas Instruments is a monolithic 150 kHz step-down (buck) switching voltage regulator with fixed 12 V output, 0.5 A load capability, ±4% output voltage tolerance over line and load, and input voltage range up to 60 V. It integrates internal power switch, oscillator, and control logic for compact DC/DC conversion in industrial power supplies.
For engineers reviewing the LM2597HVN-12 datasheet, LM2597HVN-12 pinout, LM2597HVN-12 application, or LM2597HVN-12 equivalent, key selection criteria include its HV-rated input range (up to 60 V), integrated soft-start/shutdown, error flag output, bias supply pin (VBS) for high-input-efficiency operation, and thermal shutdown protection.
Technical Context
The LM2597HVN-12 implements a current-mode PWM buck topology with a fixed 150 kHz internal oscillator, enabling predictable ripple frequency and simplified EMI filtering. Its two-stage current limit and thermal shutdown provide fault protection during overload or ambient overtemperature conditions.
It uses an internal N-channel MOSFET switch with 1.1 V (max) saturation voltage at 0.5 A, and features a dedicated bias supply pin (VBS) that powers internal circuitry independently-reducing quiescent current and improving efficiency at high VIN. The feedback loop references a stable 1.23 V bandgap, with output accuracy maintained across −40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for downstream logic or analog circuitry without external resistor network. |
| Max Input Voltage | 60 V - supports wide-input industrial, automotive, or telecom applications where unregulated bus voltages exceed 40 V. |
| Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, or interface ICs in embedded systems. |
| Switching Frequency | 150 kHz fixed - enables use of low-cost, standard inductors (e.g., 100 μH) and reduces filter size vs. lower-frequency alternatives. |
| Efficiency | 88% at VIN = 25 V, IOUT = 0.5 A - minimizes thermal stress and eliminates need for heatsinking in typical PCB layouts. |
| Quiescent Current | 140 μA (typ) in shutdown - enables ultra-low-power standby modes in battery-backed or energy-conscious systems. |
| Thermal Protection | Internal thermal shutdown at TJ = +150°C - prevents permanent damage during sustained overload or poor airflow conditions. |
Pinout & Package
LM2597HVN-12 is housed in an 8-pin surface-mount SOIC package (D package, D0008A), with 1.27 mm pitch and exposed pad for thermal enhancement. Pinout validated per TI SNVS119C Figure 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 4.5 V to 60 V DC; requires local 47–68 μF low-ESR input capacitor for transient suppression. |
| OUT | Switch Node / Power Switch Output | Drives external catch diode and inductor; high dv/dt node requiring tight layout and ground plane isolation. |
| GND | Power & Signal Ground | Common return for input/output capacitors, inductor, and feedback network; must be low-impedance copper pour. |
| FB | Feedback Input | Monitors regulated output via resistive divider (not used in fixed-12V version); internally tied to 12 V reference. |
| SD/SS | Shutdown/Soft-Start Control | Pull ≤0.6 V to disable regulator (85 μA standby); ramp voltage controls startup slew rate to limit inrush current. |
| FLAG | Error Flag Output | Open-drain active-low signal asserts when output drops below 92% of nominal (11.04 V) - enables system monitoring or sequencing. |
| DELAY | Flag Delay Control | Adjusts flag assertion delay via external RC; threshold is 1.25 V - prevents false trips during brief transients. |
| VBS | Bias Supply Input | Provides dedicated supply for internal logic; improves efficiency at high VIN by reducing gate drive losses. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Soft-Start | Controlled output ramp-up via SD/SS pin voltage - prevents input capacitor inrush and stabilizes upstream supplies. |
| Out-of-Regulation Flag | Dedicated open-drain FLAG pin with programmable delay - enables real-time health monitoring without external comparators. |
| VBS Bias Supply Pin | Separate internal power domain for control circuitry - maintains regulation stability and reduces IQ at VIN > 24 V. |
| Two-Stage Current Limit | Primary limit at 0.58 A (min), secondary foldback at overload - protects switch while allowing brief peak currents for motor or cap-charging loads. |
| Thermal Shutdown + Current Limit | Combined protection triggers at TJ ≥ 150°C or ILIM ≥ 1.4 A - ensures robust operation under fault or misapplication. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24 V truck battery to stable 12 V for microcontroller and CAN transceiver rails. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 12 V at 0.5 A with high input-voltage tolerance and thermal resilience. Use Value: Eliminates need for discrete FET + controller design; 60 V max input withstands load-dump transients up to ISO 7637-2 Pulse 5a. | Use Scenario: On-board 12 V pre-regulator feeding low-noise LDOs for infotainment audio subsystems. IC Role / Device Role / Timing Role: Efficient intermediate-stage converter reducing heat generation before final linear regulation. Use Value: 88% efficiency at 25 V input cuts power loss by >50% vs. linear solution, easing thermal management in sealed enclosures. |
| Programmable Logic Controller (PLC) I/O Module | Telecom Remote Radio Unit (RRU) |
Use Scenario: Generating isolated 12 V bias for optocoupler-based digital input conditioning circuits. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator with built-in fault signaling for diagnostics. Use Value: FLAG output directly interfaces with PLC's diagnostic MCU; ±4% output tolerance ensures reliable optocoupler LED drive across temperature. | Use Scenario: Powering 12 V RF front-end components (PA bias, mixer, ADC) in outdoor base station equipment. IC Role / Device Role / Timing Role: High-reliability DC/DC stage operating from −40°C to +85°C ambient with thermal derating. Use Value: Internal thermal shutdown and current limit meet Telcordia GR-468 reliability requirements for field-deployed telecom hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2597MX-12 | Same architecture and specs, but in PDIP-8 package (P0008E); higher θJA (95°C/W vs. 150°C/W). | Preferred for prototyping or through-hole assembly; unsuitable for high-density SMT production. | Select LM2597MX-12 only if manual soldering or socketing is required; LM2597HVN-12 offers superior thermal performance in automated SMT lines. |
| LM2596HV-12 | Higher 3 A output current, 150 kHz fixed frequency, but no VBS pin or FLAG output; wider input range (4.5–60 V). | Used where higher current is needed but system-level fault monitoring is handled externally. | Choose LM2596HV-12 for cost-sensitive, high-current designs without need for integrated flag or bias optimization. |
Compared with LM2597MX-12, LM2597HVN-12 provides better thermal dissipation in SMT layouts and smaller footprint; versus LM2596HV-12, it trades current capacity for integrated diagnostics and high-VIN efficiency via VBS-making it optimal for space-constrained, monitored 0.5 A industrial rails.
Availability
LM2597HVN-12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, PLC I/O modules, and telecom remote radio units requiring stable component supply and long-term lifecycle support.
Supply support for LM2597HVN-12 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2597HV product line was designed specifically for ruggedized step-down regulation in harsh environments-supporting wide input ranges (up to 60 V), integrated protection, and minimal external component count for industrial and transportation applications.
FAQ
What is the maximum input voltage rating for the LM2597HVN-12?
The LM2597HVN-12 supports a maximum input voltage of 60 V, as specified in the Absolute Maximum Ratings table of the TI SNVS119C datasheet. This HV rating distinguishes it from the standard LM2597 (45 V max) and enables use in 24 V and 48 V industrial or automotive systems where transient spikes occur. Operation above 40 V requires the HV variant; the LM2597HVN-12 is explicitly rated for this extended range.
Does the LM2597HVN-12 require external components to set the output voltage?
No, the LM2597HVN-12 has a factory-trimmed internal feedback network for a fixed 12 V output. Unlike the adjustable LM2597HV-ADJ version, it does not require external resistors on the FB pin. The FB pin is internally connected to the 12 V reference, simplifying design and improving accuracy over temperature and line conditions.
How does the VBS pin improve efficiency in the LM2597HVN-12?
The VBS pin on the LM2597HVN-12 supplies dedicated bias to internal control circuitry, decoupling it from the main VIN rail. At high input voltages (e.g., 48 V), this reduces gate drive losses and quiescent current, resulting in higher overall efficiency-especially evident in the 88% efficiency measured at VIN = 25 V, IOUT = 0.5 A. Without VBS, efficiency would degrade more rapidly as VIN increases.
What protection features are integrated into the LM2597HVN-12?
The LM2597HVN-12 integrates thermal shutdown, two-stage current limiting (0.58 A min primary, foldback at overload), and out-of-regulation detection with programmable delay. These functions operate autonomously without external components. The FLAG pin signals undervoltage events, while internal circuitry disables the switch during overtemperature or excessive current-ensuring robust operation in unattended or mission-critical applications.
Can the LM2597HVN-12 be used in discontinuous conduction mode (DCM)?
Yes, the LM2597HVN-12 operates reliably in both continuous and discontinuous conduction modes depending on load and inductor value. DCM occurs naturally at light loads (<100 mA), reducing switching losses and improving light-load efficiency. The device's current-mode control and fixed 150 kHz frequency ensure stable regulation across both modes, as verified in TI's Figure 23 and Figure 25 transient response waveforms.
LM2597HVN-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2597HVN-12 FAQ
1.How can I place an order for LM2597HVN-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVN-12 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2597HVN-12 reliable?
The price and inventory of LM2597HVN-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2597HVN-12 is usually 5 days.
3.What payment methods are accepted for LM2597HVN-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVN-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597HVN-12?
LM2597HVN-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVN-12 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2597HVN-12?
For technical support, including LM2597HVN-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVN-12 requirements.
6.How does Aetrix verify that LM2597HVN-12 is sourced from the original manufacturer or authorized distributors?
All LM2597HVN-12 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2597HVN-12 meets industry standards.
7.What is the process for return or replacement of LM2597HVN-12?
All LM2597HVN-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVN-12, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2597HVN-12 part is unused and in its original packaging.
Return procedure for LM2597HVN-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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